Improvement in steam-engines



UNITEE STATES PATENT OEEIoE.

GEORGE I. WASHBURN, 0F WORCESTER, MASSACHUSETTS.

IMPROVEMENT IN STEAM-ENGINES.

Speccation forming part of Letters Patent No. 57,799, dated September 4,1866.

To all whom it may concern:

Be it known that I, GEORGE I. WASEBURN, of the city and county ot'Worcester, State of Massachusetts, have made new and useful Improvementsin Steam-Engines; and I do here by declare the following to be a full,clear, and exact description of the nature, construction, and operationof thesame suflicient to enable one skilled in the art to which it isallied to construct and use the same, reference being had to theaccompanyingdrawings, which are made part of this specification, and inwhich- Figure l is a central vertical section through cylinder andvalve'chamber c f, Fig. 2. Fig. 2 1s a section through the cylinder atright angles to Fig. 1, (a b, Fig. l.) Fig. Sis a section through thevalve-chamber parallel to Fig. 2, (c d, Fig. 1.)

In this engine two double-acting pistons are arranged upon onepiston-rod in a double or diaphragm cylinder, the pistons being operatedby one valve.

In the drawings, A `A is the cylinder, which is divided in the middle bya diaphragm, B, whose central opening admits the piston-rod C. On thispiston-rod are two pistons, D E, .to whose upper and lower faces thesteam is alternately admitted and withdrawn at openings a a b b', thesteam acting simultaneously upon corresponding sides of each piston.

In the valve-chestF is a valve consisting of disks G H and a stem, I,and on each side of the valve-chest is a side chamber or pipe. (Marked,respectively, K L.) These chambers are the means of communicationbetween the valve-chest and the cylinder A A by means of the openings kZ, which lead into the valvechest, and the openings a b, leading to A,and a b leading to A.

The steam is admitted to the valve-chest through the port c, andexhausted through the ports d d', the steam constantly occupying thespace between the disks G H, which always includes the port c, andalternately includes the ports d and cl.

The valve being in the position shown in Fig. l, the steam admittedthrough opening c occupies the spa-ce between the disks G H, and passingthrough the port k, side chest, K, and ports a a, exerts its pressureupon the upper. sides ot' the pistons D E in the spaces A A ofthe doublecylinder. At the same time the steam beneath. the said pistons ispermitted to escape through the openings b b into the side chest, L, andthrough opening l into the lowehendof the valve-chamber beneath the diskH and out at the exhaust-port d, to the escape-pipe.

The return-motion is the counterpart of that described, the steam beingadmitted from the same source through opening l, side chamber,

L, ports b b, to the under sides of the pistons, the escape-steampassing through ports a a', side chest, K, port k, escaping eventuallythrough port cl. l

I have shown a double-disk valve; but the ingress and egress of steammay be controlled by a valve ot any suitable kind.

In a double engine, with cranks set upon the shaft at an angle of ninetydegrees with each other, the crank would be connected to the piston-rodo f the respective engines.

Having described myinvention, what I claim therein as new, and desire tosecure by Letters Patent, is-

l. The arrangement, in the diaphragm-cylinder, of the two pistons on thesame rod, operated as described.

2. yIn its arrangement with the double cylinder and pistons, the singlevalve controlling the steam-openings, substantially as described.

3. The arrangement ot' the valve-chest F, double-cylinder A A', and sidechests or pipes, K L, the latter communicating each by a single portwith the chest F, and simultaneously, by duplicate ports, with thespaces on corresponding sides of the two pistons.

eEo. I. WASEB'UEN.

Witnesses:

T. L. NELSON, S. P. MoEsE.

